Re: [Qexo-general] changes in the xml data file need to recompile?

[Per Bothner]

Emmanuel Emmanuel wrote:
> Hello,
> I am testing qexo in servlet.
> I have made a simple query file "ex.xql" that open a xml file with : 
> doc("example.xml") and return the results.
> I run it with tomcat and all seems ok.
> But if I (just after) change the xml file within an editor and reload 
> firefox, changes doesnt appear (or strange behavior).
> Does it mean that we have to "recompile" each time the code even if we 
> only change the xml data file ?
> And how to make it work?

This is a problem with Qexo's implementation of the "stable" semantics
of fn:doc function: XQuery requires that two calls to fn:doc(NAME) which
have the same value of NAME return the same node instances.

This can be a problem as you've seen.

One solution is to check the time-stamp of the file (assuming the URL
provides last-modified information), and re-read the file when it has
changed.

This still has the problem og memory leaks: old documents being kept
around.

A better solution is to release the cached documents by default
after running each query.  I need to think a little about how to do
that.  I'll try to figure out a solution in the next day or so.

A final solution is an option to disable caching.

I thought I had a work-around to directly call the
gnu.kawa.xml.Document:parse method, but that doesn't seem to work
for some reason.

More later.
--
        --Per Bothner
address@hidden   http://per.bothner.com/